Good morning mates,

I had a supercharge golf mk6 which I have done a stage one for it

after that, the guy has a strange noise in engine and there was no dtc

dealer told him to resore ORI in order to get the dtc

and when we did we came to find that he had a bad coil

why dtc won't appear when moded file is written on car ?

tuner told me that he did not any dtc off !